Java graphics2d:文本字段 [英] Java graphics2d: text field

问题描述

我搜索了很多主题，但没有找到具体答案.我需要在 Graphics2D 上输入字段数据(例如 JTextField 或 TextField ).

I searched for many topics but did not find any with a concrete answer. I need a field data input on the Graphics2D (like the JTextField or TextField).

有人知道我如何创建此组件吗?还是将文本字段( Component )放在 Graphics2D 中?

Does anyone know how I can create this component? Or put a text field (Component) in Graphics2D?

谢谢！

推荐答案

不是很确定您要的内容，但是这里有一些代码，当您双击时会在面板上添加文本字段.然后，您可以在文本字段中添加文本.

Not really sure what you are asking for, but here is some code that will add a text field to a panel when you double click. You can then add text to the text field.

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.text.*;

public class InvisibleTextField extends JTextField
    implements ActionListener, FocusListener, MouseListener, DocumentListener
{
    public InvisibleTextField()
    {
        setOpaque( false );
        setColumns( 1 );
        setBorder( null );
        setSize( getPreferredSize() );
        setColumns( 0 );
        addActionListener( this );
        addFocusListener( this );
        addMouseListener( this );
        getDocument().addDocumentListener( this );
    }

//  Implement ActionListener

    public void actionPerformed(ActionEvent e)
    {
        setEditable( false );
    }

//  Implement FocusListener

    public void focusLost(FocusEvent e)
    {
        setEditable( false );
    }

    public void focusGained(FocusEvent e) {}

//  Implement MouseListener

    public void mouseClicked( MouseEvent e )
    {
        if (e.getClickCount() == 2)
            setEditable( true );
    }

    public void mouseEntered( MouseEvent e ) {}

    public void mouseExited( MouseEvent e ) {}

    public void mousePressed( MouseEvent e ) {}

    public void mouseReleased( MouseEvent e ) {}

//  Implement DocumentListener

    public void insertUpdate(DocumentEvent e)
    {
        updateSize();
    }

    public void removeUpdate(DocumentEvent e)
    {
        updateSize();
    }

    public void changedUpdate(DocumentEvent e) {}

    private void updateSize()
    {
        setSize( getPreferredSize() );
    }

    public static void main(String[] args)
    {
        JPanel panel = new JPanel();
        panel.setFocusable( true );
        panel.setLayout( null );
        panel.addMouseListener( new MouseAdapter()
        {
            public void mousePressed(MouseEvent e)
            {
                JPanel panel = (JPanel)e.getSource();

                if (e.getClickCount() == 1)
                {
                    panel.requestFocusInWindow();
                }

                if (e.getClickCount() == 2)
                {
                    InvisibleTextField tf = new InvisibleTextField();
                    tf.setText("Enter Text");
                    tf.setLocation(e.getPoint());
                    panel.add( tf );
                    tf.requestFocusInWindow();
                    tf.selectAll();
                }
            }
        });

        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
        frame.add(new JLabel("Double Click to Add Text"), BorderLayout.NORTH);
        frame.add(panel);
        frame.setSize(650, 300);
        frame.setLocationRelativeTo( null );
        frame.setVisible(true);
    }
}

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